<template>
  <div class="goodsinfo-container">

    <transition
      @before-enter="beforeEnter"
      @enter="enter"
      @after-enter="afterEnter">
      <div class="ball" v-show="ballFlag" ref="ball"></div>
    </transition> 

    <!-- 商品轮播图 -->
    <div class="mui-card">
      <div class="mui-card-content">
        <div class="mui-card-content-inner">
          <swiper :lunbotuList="lunbotu" :isfull="false"></swiper>
        </div>
      </div>
    </div>

    <!-- 商品购买区域 -->
    <div class="mui-card">
      <div class="mui-card-header">{{goodsinfo.title}}</div>
      <div class="mui-card-content">
        <div class="mui-card-content-inner">
          <p class="price">
            市场价：<del>￥{{goodsinfo.market_price}}</del>&nbsp;&nbsp;销售价：<span class="now_price">￥{{goodsinfo.sell_price}}</span>
          </p>
          <p>购买数量：<numbox @getcount="getSelectedCount" :max="goodsinfo.stock_quantity"></numbox></p>
          <p>
            <mt-button type="primary" size="small">立即购买</mt-button>
            <mt-button type="danger" size="small" @click="addToShopCar">加入购物车</mt-button>
          </p>
        </div>
      </div>
    </div>

    <!-- 商品参数区域 -->
    <div class="mui-card">
      <div class="mui-card-header">商品参数</div>
      <div class="mui-card-content">
        <div class="mui-card-content-inner">
          <p>商品货号：{{ goodsinfo.goods_no }}</p>
          <p>库存情况：{{ goodsinfo.stock_quantity }}</p>
          <p>上架时间：{{ goodsinfo.add_time | dateFormat}}</p>
        </div>
      </div>
      <div class="mui-card-footer">
        <mt-button type="primary" size="large" plain @click="goDesc(id)">图文介绍</mt-button>
        <mt-button type="danger" size="large" plain @click="goComment(id)">商品评论</mt-button>
      </div>
    </div>
  </div>
</template>
<script>
//导入轮播图组件
import swiper from '../subcomponents/swiper.vue';
//导入 数字选择框组件
import numbox from '../subcomponents/goodsinfo_numbox.vue'
export default {
  data () {
    return {
      id: this.$route.params.id,   //将路由参数对象中的id挂载到 data，方便后期调用
      lunbotu: [],   //轮播图的数据
      goodsinfo: {},   //获取到的商品的信息
      ballFlag: false,  //控制小球的隐藏和显示的标识符
      selectedCount: 1  //保存用户选中的商品数量
    }
  },
  created() {
    this.getLunbotu();
    this.getGoodsInfo()
  },
  methods: {
    getLunbotu() {
      this.$http.get("api/getthumimages/" + this.id).then(result => {
        if(result.body.status === 0) {
          result.body.message.forEach(item => {
            item.img = item.src
          })
          this.lunbotu = result.body.message;
        }
      })
    },
    getGoodsInfo() {
      //获取商品的信息
      this.$http.get("api/goods/getinfo/" + this.id).then(result => {
        if(result.body.status === 0) {
          this.goodsinfo = result.body.message[0]
        }
      })
    },
    goDesc(id) {
      //点击使用编程式导航跳转到图文介绍页面
      this.$router.push({name: "goodsdesc", params: {id}});
    },
    goComment(id) {
      this.$router.push({name: "goodscomment", params: {id}})
    },
    addToShopCar() { 
      //添加到购物车
      this.ballFlag = !this.ballFlag;
      var goodsinfo = {
        id: this.id,
        count: this.selectedCount,
        price: this.goodsinfo.sell_price,
        selected: true
      }
      this.$store.commit("addToCar", goodsinfo)
    },
    beforeEnter(el) {
      el.style.transform = "translate(0, 0)";
    },
    enter(el, done) {
      el.offsetWidth;   //强制让动画/页面重绘
      //获取小球在页面中的位置
      const ballPosition = this.$refs.ball.getBoundingClientRect();
      //获取徽标在页面中的位置
      const badgePosition = document
        .getElementById("badge")
        .getBoundingClientRect();

      const xDist = badgePosition.left - ballPosition.left;
      const yDist = badgePosition.top - ballPosition.top;

      el.style.transform = `translate(${xDist}px, ${yDist}px)`;
      el.style.transition = "all 0.5s cubic-bezier(.4,-0.3,1,.68)";
      done();
    },
    afterEnter(el) {
      this.ballFlag = !this.ballFlag;
    },
    getSelectedCount(count) {
      this.selectedCount = count;
      // console.log("父组件拿到的数量值为：" + this.selectedCount)
    }
  },
  components: {
    swiper,
    numbox
  }
}
</script>
<style lang="scss" scoped>
.goodsinfo-container {
  background-color: #eee;
  overflow: hidden;
  .now_price {
    color: red;
    font-size: 16px;
    font-weight: bold;
  }
  .mui-card-footer {
    display: block;
    button {
      margin: 15px 0;
    }
  }
  .ball {
    width: 15px;
    height: 15px;
    border-radius: 50%;
    background-color: red;
    position: absolute;
    z-index: 99;
    top: 390px;
    left: 146px;
  }
}
</style>

 